Officers found evidence of gunfire in the parking lot of Taco Bell, located on the southwest corner of the intersection, police said. Witnesses told police a suspect appeared to be shooting at a person in a car but struck the bus instead.

No gunshot victims were located at the scene or arrived at any area hospitals. Witnesses described several people involved in a disturbance leading to gunfire and several vehicles left the area after the shots, police said.

Several officers, including a Canine Unit, searched the neighborhood but did not locate any suspects. The Gang Enforcement Team is investigating the incident.

The bus was preparing to turn north onto Northeast Martin Luther King Jr. Boulevard from Lombard when it was hit by gunfire, said TriMet spokesperson Tia York.

"Thankfully, neither the operator nor the two passengers on board was hurt," York wrote in an email. "After checking on the passengers, the bus driver called the command center."